Go Down

Topic: FAQ - READ THIS - (Read 9546 times) previous topic - next topic


Jan 19, 2017, 11:56 am Last Edit: May 02, 2017, 02:46 pm by AndreaRichetta
Getting started Guide is available through the Main product page

MKR1000 Product page

Q: I plugged the board to my PC but cannot see the serial port listed on the IDE, I cannot upload sketch to the board!
A: The first thing to try is manually put the CPU into bootloader mode, this is accomplished by pressing quickly twice the reset button (you need a pencil to actually push the button).
Another try is to change the USB cable: some micro-USB cables are "power only", you'll see the board powered but no data connection to the PC.

Q: I plugged the board, I can see the serial port but I cannot upload sketch
A: If still on, remove the conductive foam that protects the pins.

Q:What if I have issues with TLS/SSL connections?
A: you can upload a custom SSL certificate by using the firmware upldater. See the full guide

Q: What's the pin number of the onboard LED? Pin 13 seems to not work...
A: The LED is connected to pin 6, but you can use the LED_BUILTIN constant instead of declaring the pin number.

Q: What does the CHRG LED blinking indicates?
A: Indicates that the board is charging the LiPo battery connected to the white JST connector. Please note that the charger use a constant current of 350mA, this means that you must use a LiPo battery with a minimum capacity of 700mAh otherwise you risk unpleasant side-effects like flames and/or explosions.

Q: After some time the Charge LED starts blinking even if no battery is attached to the JST connector
A: The CHARGE LED on the board is driven by the charger chip. This LED starts to blink at a frequency of about 2Hz (slow blink) if a defective or no battery is connected to the JST connector.

Q: Which are the interrupt capable pins?
A: check the Technical Specs

Q: Which are the pins that can generate PWM?
A: check the Technical Specs

Q: I see that A0 is marked as DAC0. There is a DAC on that pin? is usable?
A: Yes, there is a DAC and it's usable, you can control the pin with analogWrite(..).

Q: Which is the VIN range voltage value?
A: VIN Nominal voltage value is 5V, range is from 5V to 6V (6V is the Maximum)

Q: I installed a certificate but I cannot establish an HTTPS connection.
A: Check if the certificate is loaded and is SHA 256. The 348 is still not yet supported. Comodo for example has certificate SHA-348 with RSA encryption

Q: Which is the polarity of the battery?
A: Looking at the connector pins : Left = Positive, Right = GND

Q: What Vin, 5V and VCC means?
A: Vin.
This pin can be used to power the board with a regulated 5V source. If the power is fed through this pin, the USB power source is disconnected. This is the only way you can supply 5v (range is 5V to maximum 6V) to the board not using USB. This pin is an INPUT.
This pin outputs 5V from the the board when powered from the USB connector or from the VIN pin of the board. It is unregulated and the voltage is taken directly from the inputs. When powered from battery it supplies around 3.7 V.  As an OUTPUT, it should not be used as an input pin to power the board.
This pin outputs 3.3V through the on-board voltage regulator. This voltage is the same regardless the power source used (USB, Vin and Battery)..


Nov 07, 2019, 04:09 pm Last Edit: Dec 02, 2019, 04:45 pm by ballscrewbob

READ THIS POST to help you get the best out of the forum.


These steps may also save you some unnecessary time and effort in the forum.

  • Always provide as much detail as possible to your issue it may be important.
  • If applicable provide your SKETCH inside CODE TAGS ( </> ) or a CREATE share link.
  • If applicable provide a schematic even if hand drawn.
  • How to insert a picture into your post
  • If applicable provide a proper LINK to the hardware / sensors etc. you are using.

  • Check you have a COMMON GROUND where required.
  • Where possible use USB 2.0 ports or a USB 2.0 POWERED HUB to rule out USB 3.0 issues.
  • Try other computers where possible.
  • Try other USB leads where possible.
  • You may not have the correct driver installed. CH340/341 or CP2102
  • There may be a problem with the board check your wiring first.
  • Remove any items connected to pins 0 and 1.

  • close any other serial programs before opening the IDE.
  • Ensure you turn off any additional security / antivirus just to test.
  • There may be a problem with the PC try RESTARTING it.
  • You may be selecting the wrong COM port.
  • Avoid cloud/network based installations where possible OR ensure your Network/Cloud software is RUNNING.
  • Clear your browsers CACHE.
  • Close the IDE before using any other serial programs.
  • Preferably install IDE's as ADMINISTRATOR or your OS equivalent

Arduino specific boards

CREATE editor install locations.
  • On macOs ~/Applications/ArduinoCreateAgent-1.1/ArduinoCreateAgent.app/Contents/MacOS/config.ini
  • On Linux ~/ArduinoCreateAgent-1.1/config.ini
  • On Windows C:\Users[your user]\AppData\Roaming\ArduinoCreateAgent-1.1

Performing the above actions may help resolve your problem without further help.

Language problem ?
Try a language closer to your native language:

Thanks to all those who helped and added to this list.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google (who would have thunk it ! ) or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

Go Up